OMP PHP Warning: fopen(): mkdir(): flock() include(/cpanel_data/icebook/public_html/cache/fc-pluginSettings-1-urnpubidplugin.php):


i am ussing OMP and i am faceing following PHP Warning. Please help to solve the worning in PHP.
I have only FTP access of server and only numeric permission provide through FTP access.
cache folder permission 777 and all other folder permission 775
files_dir folder permission 777

PHP Warning: mkdir(): Permission denied in /cpanel_data/icebook/public_html/lib/pkp/classes/file/ on line 312
PHP Warning: mkdir(): No such file or directory in /cpanel_data/icebook/public_html/classes/codelist/ on line 82
PHP Warning: fopen(): Filename cannot be empty in /cpanel_data/icebook/public_html/lib/pkp/classes/scheduledTask/ on line 111
PHP Warning: flock() expects parameter 1 to be resource, bool given in /cpanel_data/icebook/public_html/lib/pkp/classes/scheduledTask/ on line 112
PHP Warning: include(/cpanel_data/icebook/public_html/cache/fc-pluginSettings-1-urnpubidplugin.php): failed to open stream: No such file or directory in /cpanel_data/icebook/public_html/lib/pkp/classes/cache/ on line 46
PHP Warning: include(): Failed opening ‘/cpanel_data/icebook/public_html/cache/fc-pluginSettings-1-urnpubidplugin.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php73/root/usr/share/pear’) in /cpanel_data/icebook/public_html/lib/pkp/classes/cache/ on line 46